public void Initialize()
        {
            savedActivities.Initialize();

            var activities = savedActivities.LoadAll();

            foreach (var activity in activities)
            {
                Activities.Add(new ActivityViewModel(activity));
            }

            var activityTypes = activityLoader.LoadAll();

            foreach (var type in activityTypes)
            {
                ActivityTypes.Add(new ActivityTypeViewModel(type));
            }

            NewActivityType = ActivityTypes.FirstOrDefault();
            NewActivityName = String.Empty;
        }